33.50.00 Hydrocarbon Utilities
33.51.00 Hydrocarbon Sources
33.51.13 Appraisal Wells for Liquid Hydrocarbons 33.51.16 Appraisal Wells for Gaseous Hydrocarbons 33.51.23 Production Wells for Liquid Hydrocarbons 33.51.26 Production Wells for Gaseous Hydrocarbons 33.51.33 Liquid Injection Wells 33.51.36 Gas Injection Wells 33.51.39 Monitoring Wells 33.51.53 Reciprocating Pumpjack 33.51.56 Submersible Liquid Hydrocarbon Pumps